-----Original Message-----
> From: snipped-for-privacy@telecom-digest.org
> [mailto: snipped-for-privacy@telecom-digest.org]
> Sent: 25 October 2008 11:55
> To: snipped-for-privacy@invalid.telecom-digest.org
> Subject: The Telecom digest (1 messages)
>
> Message Digest
> Volume 27 : Issue 279 : "text" Format
>
> Messages in this Issue:
> Re: About CAS and CCS [Telecom]
>
> ---------------------------------------------------------------------- >
> Date: 24 Oct 2008 17:53:37 GMT
> From: Doug McIntyre
> To: snipped-for-privacy@invalid.telecom.csail.mit.edu
> Subject: Re: About CAS and CCS [Telecom]
> Message-ID:
>
> Lexic> >What is the difference between CAS and CCS signalling for E1.
> >Control signals are both carried in 16th timeslot, so what's
> the main
> >difference ?
>
> CAS does not carry signalling info on the 16th timeslot (for E1).
There is no robbed bit in E1. Instead, 16 frames are formed into a multiframe. One frame contains the multiframe alignment signal (MFAS) in TS16. The 4-bit nibls (half-bytes) in the remaining 15 frames' TS16s are structured as 30 separate 4 kBit/s control channels for the
30 traffic timeslots. It carries information in the robbed bits out of each voice channel.
No it doesn't.
> A PRI E1 is using CCS. (although SS7 signalling in the 16th
> timeslot is also an option for CCS).
>
> OOTH, CAS retains all channels of the span for voice, and
> much simpler signalling is carried in-band of each channel.
See above.